1)(4/5)²=4/5*4/5=16/25
2)(-2/3)²=-2/3(-2/3)=4/9
3)(1 1/2)²=3/2*3/2=9/4=2 1/4
4)(-2 1/4)²=-9/4(-9/4)=81/16=5 1/16
5)(2,1)²=2,1*2,1=4.41
6)(-6)³=-6(-6)(-6)=-216
7)9³=9*9*9=729
8)(-1)³=-1(-1)(-1)=-1
9)(1 3/4)³=7/4*7/4*7/4=343/64=5 23/64
10)(-1,2)³=-1,2(-1,2)(-1,2)=-1,728
X = 2 +y;
2(2+y) - 3y =- 1;
4 -2y - 3 y = -1;
- y = - 5;
y = 5.
x = 2 +y= 2+5=7.
x=7; y=5
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Photomath - помогает тебе
Решение
(ctgα)*(sinα) = (cosx/sinx) * sinx = cosx